Red and White Roses

Hannah is the youngest princess in the Kingdom of Dahlia.
Her father, the king, has a very kind and generous personality, but because she's the youngest, she isn't allowed to do things freely like her two older sisters.
And since she isn't allowed to go into certain rooms, she explores other places, like the large garden in the back yard.
(Or her mother's closet)
Instead of going to school like her sisters, she stays at the palace and cleans with the housemaids by free will.
She comes after her father with the kindness and generosity.
But she's also very shy and quiet,
(not completely mute, just doesn't talk much.)

When she turns 15, something incredible happens.
She decides to go into a room she's never seen or heard of before.
And it's incredible.

What will this little event lead to?
Is it a good future?
Or a bad one?

(All the kingdoms are named after different flowers)